Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 215Get this manual
OIL INJECTION
Oil System Troubleshooting
Low Oil Warning System is Activated
Problem Low oil level in engine oil reservoir but not low in remote oil tank Note: Oil level in engine oil reservoir should be up to the fill cap Problem Low oil level in engine oil reservoir and also remote oil tank Refill both oil tanksPurge air from engine oil tankRefer to procedure Problem Oil level is not low in either tank Disconnect blue wires going to the low oil float switch in the engine oil reservoirCheck switch for continuity Problem Oil leaks out of exhaust or #6 cylinder Pulse hose and oil supply hose are reversed Boat oil tank is mounted higher than pulse hose fitting on engine and oil tank is over-filled
Air was never purged from engine oil tank
Purge air from engine oil tankRefer to procedure
Fill cap is leaking air on remote tank